Gree GWH09RB-K3DNA2C Service Manual page 65

(2) IPM Protection, Out-of step Fault,Compressor Phase Over current(AP1 below refers to the outdoor control panel)
Mainly detect:
If the connection between control panel AP1 and compressor COMP is secure? If loose? If the connection is in correct order?
If the voltage input of the machine is within normal range? (Use AC voltmeter to measure the voltage between terminal L and N on
the wiring board XT)
If the compressor coil resistance is mormal? If the insulation of compressor coil against the coppertube is in good condition?
If the working loads of the machine are too high? If the radiation is good?
If the charge volume of refrigerant is correct?
Fault diagnosis process:
Energize and
IPM protection
occurs after the
machine has run for
a period of time?
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
62
switch on
Use AC voltmeter
to measure the
voltage between
Y
terminal L and N
on the wiring
board XT)
Voltage between
the two ends of
Y electrolytic
capacitor is
higher than 250V
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
Stop the unit and
dirty? If they are
disconnect the power
obstructed by other
supply. Then, check
objects which affect
the connection of
the heat exchange
capacitor C2
of indoor and
according to Electrical
outdoor unit.
Wiring Diagram.
2. If the indoor and
outdoor fans are
working normally?
Remove the wires
3. If the environment
on the two ends of
temperature is too
capacitor C2. Then,
high, resulting in
use capacitance
that the system
meter to measure
pressure is too high
the capacitor C2.
and exceeds the
Verify as per the
permissible range?
Parameters Sheet.
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
If capacito r
pressure is too
high?
C2 is failed?
5. Other conditions
resulting in that the
system pressure
becomes too high.
If there is any
described above?
Connect the control panel
AP1 and compressor
COMP correctly according
Y
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
resistance is
normal?
If the voltage
between terminal L
and N on wiring
board XT is within
210VAC~250VAC?
Y
Start and run the
unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
between the two
ends of electrolytic
capacitor on control
panel AP1
N
The connection
of capacitor C2
is loose.
N
Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage
between the two ends of
capacitor C2, until the
voltage is lower than 20V
Replace the capacitor
Y C2. Then, energize
and start the unit.
Replace the
N
control panel AP1
Take corrective actions
according to Technical
abnormality
Y
Service Manual, and
then energize and start
the unit.
Replace the
N
control panel AP1
If the
Replace the
compressor
N
COMP
N
Resistance higher
than 500M ?
Y
Replace the
control panel
AP1
END
Check the supply
voltage and
N
restore it to
210VAC~250VAC
If the unit can
work
N
normally?
Reconnect the
capacitor C2 according
to Electrical Wiring
Y
Diagram. Then,
energize and start the
unit.
If the unit can
N
work
normally?
If the unit can
work
normally?
N
If the unit can
work
normally?
N
If the unit can
work Y
normally?
Troubleshooting
Y
Y
Y
Y